<h2>编程题</h2>
<ul class="chooseUl">
    <li>
        <h4>
            {{item.question}}
        </h4>
        <nz-input [nzType]="'textarea'" [nzRows]="'4'" [ngModel]="userExam.answer1" (ngModelChange)="customChange($event)" style="display: inline-block;width: 70%;"></nz-input>
    </li>
</ul>